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This package provides classes to perform curve fitting.

<p>Curve fitting is a special case of a least squares problem
were the parameters are the coefficients of a function <code>f</code>
whose graph <code>y=f(x)</code> should pass through sample points, and
were the objective function is the squared sum of residuals
<code>f(x<sub>i</sub>)-y<sub>i</sub></code> for observed points
(x<sub>i</sub>, y<sub>i</sub>).</p>

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